Question

what is the correlation between depolarization and repolarization as well as contraction and relaxation of the heart? ​

Answer 1

Answer:

Atrial systole extends until the QRS complex, at which point, the atria relax. The QRS complex represents depolarization of the ventricles and is followed by ventricular contraction. The T wave represents the repolarization of the ventricles and marks the beginning of ventricular relaxation

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Answer 2

The key difference between depolarization and hyperpolarization is that in depolarization, sodium channels open up, letting Na+ ions flow inside the cell, making membrane potential less negative, while in hyperpolarization, excess potassium channels open up, letting K+ ions to flow out the cell, making membrane potential more negative than the resting potential.

Action potential is the mode by which neurons send electrical signals. It occurs when a neuron sends information along an axon away from the cell body. There are three main stages in action potential. They are depolarization, repolarization and hyperpolarization. Depolarization triggers an action potential. Depolarization occurs when the inside of the cell becomes less negative. Na+ channels open up and allow Na+ ions to go inside the cell, making it less negative. Therefore, the membrane potential goes from -70 mV to 0 mV in depolarization. Hyperpolarization occurs when the inside of the cell becomes more negative even than the original resting potential. It occurs as a result of opening K+ channels, allowing more K+ ions to flow out of the cell. Membrane potential goes from -70 mV to -90 mV in hyperpolarization.